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Okay, I just reinstalled High Sierra 10.13.4 clean install, now everything seems to be in order, no artefacts, both screens working flawlessly. So if anyone else should happen to run into this problem, this is the simplest solution as far as I know :)

Hi, I am pretty new to the hackintosh scene, I have had Sierra 10.14.2 running for quite a while, problem free. However I decided to upgrade to High Sierra 10.13.4 today, and the results are quite a mess, the system is running fine, except for my 4k screen which is looking like something like...